I will add my comments. I am 72. Have both hips replaced and recent stenosis back surgery. Own a 2011 DL650 and DRZ400S. My wife is 63 with a 1995 Honda ACE Shadow. She has 30,000 on the bike but doesn't ride much. I ride a bit with half of it off paved roads on both Suzuki's. I regeared the DL lower and it has knobbies and skid plate, but I am very careful where I go with it. Am a bit more adventurous with the 400 but still I have to exert some control on myself as I am usually alone...yes, I know...a bad idea. I have had to pick up the 400 numerous times and the DL a couple times. I can still do it, but very carefully with the DL.
I toyed with the idea of a sidecar on the DL to enable me to take my dog, but the cost and my discovery that piloting a hack is more strenuous that I knew eliminated that option. The DL is immaculate and selling it when I can still ride it is not being considered. I did lower the rear 3/4" and relocated the foot pegs which helped quite a bit...mostly the pegs. The suspension has been reworked and that made it possible for me to go off pavement. Still, the 500 lbs. is a challenge at times and I find I evaluate where I stop and how I stop on cambered surfaces. I tried trading both Suzuki's off for something in the 400 lb. class, but $$$$ was too much a factor.
The DRZ is easier for me to ride and I find it to be more pleasing due to its weight and my limited riding. A new seat, handlebars and wider footpegs were appreciated improvements...especially the seat. I will be lowering the suspension internally this year 2". I restrict myself to what off road riding I do with this bike too, but do ride roads I would not take the DL on.
Everyone knows the day is coming when It's "over", time to "hang it up", etc. I intend to go as long as I can.
I still have my Yamaha TT 500 framer. Now if they run the Sacramento Mile this May with the Sunday Amateur event........